Under the weather

I wonder what the origin of the phrase "under the weather" is? In any case, that's where I am. I am dealing with a cold; it started out as a sore throat and now is chest congestion. So I didn't go to a movie last night with John and Cynthia, and also didn't go church this morning; stayed in bed and am keeping warm. Did the Spelling Bee puzzle; Ellen is feeding me good food; I'm dozing. We're reading Henry V out loud; that is really enjoyable! Not sure if I'll be up for going to the Osher lecture tomorrow or not. But maybe I will.